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cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
兩位數除以一位數（一）
算柱 (兩位數)
【案例】2018年全国1卷理科12题
四邊形的特性
畫出對稱圖形
Discover Resources
銳角三角函數值的大小比較
比較小數的大小
DSE Circle-ACT05B Exterior Angle of a Cyclic Quadrilateral
錐體的橫截面
no10